/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.talkback.labeling;

import com.android.utils.labeling.CustomLabelManager;
import com.android.utils.labeling.Label;
import com.android.utils.labeling.LabelProviderClient;

import java.util.ArrayList;
import java.util.List;

public class ImportLabelRequest extends LabelClientRequest<Integer> {

    private final List<Label> mLabels;
    private final boolean mOverrideExistingLabels;
    private final OnImportLabelCallback mCallback;

    public ImportLabelRequest(LabelProviderClient client, List<Label> labels,
                              boolean overrideExistingLabels,
                              OnImportLabelCallback listener) {
        super(client);
        mLabels = labels;
        mOverrideExistingLabels = overrideExistingLabels;
        mCallback = listener;
    }

    @Override
    public Integer doInBackground() {
        if (!mClient.isInitialized()) {
            return 0;
        }

        mClient.deleteLabels(CustomLabelManager.SOURCE_TYPE_BACKUP);
        mClient.updateSourceType(CustomLabelManager.SOURCE_TYPE_IMPORT,
                CustomLabelManager.SOURCE_TYPE_USER);
        List<Label> currentLabels = mClient.getCurrentLabels();
        if (currentLabels == null) {
            currentLabels = new ArrayList<>();
        }

        LabelSeparator separator = new LabelSeparator(currentLabels, mLabels);
        List<Label> newLabels = separator.getImportedNewLabels();
        int updateCount = 0;
        int labelCount = newLabels.size();
        for (int index = 0; index < labelCount; index++) {
            Label label = newLabels.get(index);
            mClient.insertLabel(label, CustomLabelManager.SOURCE_TYPE_IMPORT);
            updateCount++;
        }

        if (mOverrideExistingLabels) {
            List<Label> existentConflictLabels = separator.getExistingConflictLabels();
            int existentLabelCount = existentConflictLabels.size();
            for (int index = 0; index < existentLabelCount; index++) {
                Label label = existentConflictLabels.get(index);
                mClient.updateLabelSourceType(label.getId(), CustomLabelManager.SOURCE_TYPE_BACKUP);
            }

            List<Label> importedConflictLabels = separator.getImportedConflictLabels();
            int importedLabelCount = importedConflictLabels.size();
            for (int index = 0; index < importedLabelCount; index++) {
                Label label = importedConflictLabels.get(index);
                mClient.insertLabel(label, CustomLabelManager.SOURCE_TYPE_IMPORT);
                updateCount++;
            }
        }

        return updateCount;
    }

    @Override
    public void onPostExecute(Integer result) {
        if (mCallback != null && result != null) {
            mCallback.onLabelImported(result);
        }
    }

    public interface OnImportLabelCallback {
        public void onLabelImported(int changedLabelsCount);
    }
}
